New to this hobby

my name is Audra and Ken we are new to this we have 2 chickens a Bardrock and a Silky but our real joy is our 7 ducks 3 swedes 2 blacks and a Blue 3 Mallards and an East indian. one of our ducks left us a very strange color egg and wondering if it is normal for it to be ombre colored they just started laying and we are not quite sure who it is from yet.